Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07956f4318e4e61…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 01:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a35decc903f5aca758604d0a22efa5fc SHA-1: 40146f6a103e35b735b1fe4146e55ffe75846ab9 SHA-256: a07956f4318e4e610ca2bb04bfcc3bc7ce6bdae028752cc1349a30a553816a3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://esebtekstil.com/resimler/files/gopujazorexapibopimoza.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf3591669---lijefatikemebupur.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bc27f95cae9---vikilofofitobitufawebafes.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/35o6ch8b6rm69gvmd9jvdj6530/kiwitekasujutufibalu.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/32122119126.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/44883007287.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/buvexarelenikuragu.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/nimogubuze.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/46892661326.pdfIn PDF document text
    • http://simonide.org/userfiles/file/xurifigifekagoradenem.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2108111036513139112l2km9.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/zuwovaribojidaxejarobape.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/mikaboxobifalorujageto.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l255nlrpkp2cr24qgqnagcvi7j/pebagukumanakowudir.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/37097506326.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bca741ea636---550191827.pdfIn PDF document text
    • https://razredna-nastava.net/files/43950377943.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210816_073559.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/zudomikekek.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/73252525064.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/suv9j3j7920tobk3ui3ct5r3n6/jujanoduwowufezako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=four+personality+types+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 10680 bytes
SHA-256: 6c6d5c7e8548b5992fa12410911c020e85ba3e3d07279174ce19e0781098f0ca
font_02_sfnt_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 17400 bytes
SHA-256: 95b620380470603b924a4b4167826609c607a5153365e69b353ce834e17c936a

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